6(a+7)=7(a+9)

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Solution for 6(a+7)=7(a+9) equation:


Simplifying
6(a + 7) = 7(a + 9)

Reorder the terms:
6(7 + a) = 7(a + 9)
(7 * 6 + a * 6) = 7(a + 9)
(42 + 6a) = 7(a + 9)

Reorder the terms:
42 + 6a = 7(9 + a)
42 + 6a = (9 * 7 + a * 7)
42 + 6a = (63 + 7a)

Solving
42 + 6a = 63 + 7a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-7a' to each side of the equation.
42 + 6a + -7a = 63 + 7a + -7a

Combine like terms: 6a + -7a = -1a
42 + -1a = 63 + 7a + -7a

Combine like terms: 7a + -7a = 0
42 + -1a = 63 + 0
42 + -1a = 63

Add '-42' to each side of the equation.
42 + -42 + -1a = 63 + -42

Combine like terms: 42 + -42 = 0
0 + -1a = 63 + -42
-1a = 63 + -42

Combine like terms: 63 + -42 = 21
-1a = 21

Divide each side by '-1'.
a = -21

Simplifying
a = -21

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